<!doctype html> <html lang="en"> <head> <script> var script = document.createElement('script'); // Don't do this at home kids! The "document.referrer" part is actually inserting a XSS security. // We are OK in this precise case because the HTML page is hosted on the "maps" domain that contains only static files. script.setAttribute('src', document.referrer + 'iframe_api.js'); document.head.appendChild(script); window.addEventListener('load', () => { WA.chat.sendChatMessage('The iframe opened by a script works !', 'Mr Robot'); }) </script> </head> <body> <p>Website opened by script.</p> </body> </html>